ATTINY28L-4AU Atmel, ATTINY28L-4AU Datasheet - Page 34

• Manufacturer Part Number: ATTINY28L-4AU
• Description: IC MCU AVR 2K FLASH 4MHZ 32-TQFP
• Manufacturer: Atmel
• Series: AVR® ATtinyr

Specifications of ATTINY28L-4AU

• Core Processor: AVR
• Core Size: 8-Bit
• Speed: 4MHz
• Peripherals: POR, WDT
• Number Of I /o: 11
• Program Memory Size: 2KB (1K x 16)
• Program Memory Type: FLASH
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 32-TQFP, 32-VQFP
• Processor Series: ATTINY2x
• Core: AVR8
• Data Bus Width: 8 bit
• Data Ram Size: 32 B
• Maximum Clock Frequency: 4 MHz
• Number Of Programmable I/os: 11
• Number Of Timers: 1
• Maximum Operating Temperature: + 85 C
• Mounting Style: SMD/SMT
• 3rd Party Development Tools: EWAVR, EWAVR-BL
• Development Tools By Supplier: ATAVRDRAGON, ATSTK500, ATSTK600, ATAVRISP2, ATAVRONEKIT
• Minimum Operating Temperature: - 40 C
• On-chip Adc: 8 bit
• Package: 32TQFP
• Device Core: AVR
• Family Name: ATtiny
• Maximum Speed: 4 MHz
• Ram Size: 32 Byte
• Operating Supply Voltage: 3.3|5 V
• For Use With: ATSTK600-DIP40 - STK600 SOCKET/ADAPTER 40-PDIPATSTK500 - PROGRAMMER AVR STARTER KIT
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Eeprom Size: -
• Ram Size: -
• Data Converters: -
• Connectivity: -
• Lead Free Status / Rohs Status: Details

Timer/Counter0
Timer/Counter Prescaler
34
ATtiny28L/V
The ATtiny28 provides one general-purpose 8-bit Timer/Counter – Timer/Counter0.
Timer/Counter0 has prescaling selection from the 10-bit prescaling timer. The
Timer/Counter0 can either be used as a timer with an internal clock time base or as a
counter with an external pin connection that triggers the counting.
Figure 28 shows the Timer/Counter prescaler.
Figure 28. Timer/Counter0 Prescaler
The four different prescaled selections are: the hardware modulator period, CK/64,
CK/256 and CK/1028, where CK is the oscillator clock. CK, external source and stop
can also be selected as clock sources.
Figure 29 shows the block diagram for Timer/Counter0.
Figure 29. Timer/Counter0 Block Diagram
FROM MODULATOR
COUNT ENABLE
INTERRUPT CONTROL
TIMER/COUNTER0
REGISTER (ICR)
CS00
CS01
CS02
CK
T0
(TCNT0)
T/C0 OVER-
FLOW IRQ
INTERRUPT FLAG
REGISTER (IFR)
TIMER/COUNTER0 CLOCK SOURCE
0
10-BIT T/C PRESCALER
TCK0
CONTROL
LOGIC
REGISTER (TCCR0)
T/C0 CONTROL
1062F–AVR–07/06
T0